At a riding school near Limmen you hitch up a horse trailer with a permitted maximum mass of 4,000 kg. You drive onto the A22, an autoweg. What is your maximum speed?
80 km/u — the trailer is heavier than 3,500 kg, so the ordinary road-type figure applies
90 km/u — with a trailer on an autoweg it's always 90 anyway
130 km/u — a 130 autoweg sign applies to all vehicles driving on it
Explanation
Wrong — trap: weight-blind. The 90 km/u only applies up to and including 3,500 kg permitted maximum mass; at 4,000 kg you fall back to the ordinary outside-built-up-area figure of 80 (Book p.119).